基础检测
一、1、have been
2、has bee
3、has gone
4、Have；bee；have been
5、has gone，has been
6、has bee
7、have；been
8、has gone
9、has gone
10、have；been
二、1、for
2、since
3、since；for
4、for
5、since
6、since
7、for
8、since
9、for
10、since
三、1、has been over
2、for over three days / for about four day.s
3、started/began
4、has been away from
5、has kept
6、has been in
7、has been a meber of
8、has been dead
四、1、have you been，have been to
2、have had
3、has been in；will return to
4、has gone to；has been to；twice；has been there for three days
技能提升
1-5：D C B A